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Subsequent Events (Details) (USD $)
 0 Months Ended 3 Months Ended
Apr. 23, 2014
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Subsequent Event [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity $ 470,000,000      
Amortization of Financing Costs and Discounts 300,000 633,000 555,000  
Line of Credit Facility, Remaining Borrowing Capacity 332,000,000 206,000,000    
Letters of Credit Outstanding, Amount   $ 9,200,000    
Percentage Of One Month Interest rate Plus London Interbank Offering Rate 1.00% 1.00%    
Debt Instrument Interest Coverage Ratio 2.50 3.00    
Debt Instrument Leverage Ratio 3.00     2.25
Maximum [Member]
        
Subsequent Event [Line Items]        
Percentage Of Margin Plus London Interbank Offered Rate 2.00% 2.25%    
Percentage Of Margin Plus Alternate Base Rate 1.00% 1.25%    
Line of Credit Facility, Commitment Fee Percentage 0.35% 0.40%    
Minimum [Member]
        
Subsequent Event [Line Items]        
Percentage Of Margin Plus London Interbank Offered Rate 1.25% 1.50%    
Percentage Of Margin Plus Alternate Base Rate 0.25% 0.50%    
Line of Credit Facility, Commitment Fee Percentage 0.20% 0.25%